JP2007077585A - Tunnel construction method - Google Patents

Tunnel construction method Download PDF

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JP2007077585A
JP2007077585A JP2005263280A JP2005263280A JP2007077585A JP 2007077585 A JP2007077585 A JP 2007077585A JP 2005263280 A JP2005263280 A JP 2005263280A JP 2005263280 A JP2005263280 A JP 2005263280A JP 2007077585 A JP2007077585 A JP 2007077585A
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clay
plate
pit
water
waterstop
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Taku Ishii
卓 石井
Hitoshi Nakajima
均 中島
Hiroo Kumasaka
博夫 熊坂
Hiroyuki Tada
浩幸 多田
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Shimizu Corp
清水建設株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel construction method for constructing an underground gallery which can prevent leakage of noxious materials eluting from waste over a very long period of time. <P>SOLUTION: According to the tunnel construction method for constructing the underground gallery where the waste is embedded and disposed of, a plurality of support members 4 in a pit excavated in the ground G, extending in a pit circumferential direction, are arranged side by side at intervals in a pit axial direction, and a plate member 6 is sandwiched between the support members 4, 4 adjacent to each other, followed by filling a clay-based water cutoff material 7 containing a swelling clay material in a gap between the plate member 6 and a pit wall surface 2a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、廃棄物を埋設処分する地下坑道を構築するためのトンネル工法に関する。   The present invention relates to a tunnel construction method for constructing an underground tunnel for burying waste.

廃棄物を処分する方法として、地盤内に構築された地下坑道内に廃棄物を収納した後、当該坑道を埋め戻し、廃棄物を埋設処分する方法がある。この方法で廃棄物を処分する場合、廃棄物から溶出される有害物質の漏洩を防止する必要がある。したがって、従来、廃棄物処理用の坑道を構築するトンネル工法は、掘削された坑の壁面をコンクリート等で覆工する方法が採用されている。   As a method of disposing of the waste, there is a method of storing the waste in an underground mine constructed in the ground and then backfilling the mine to bury the waste. When disposing of waste by this method, it is necessary to prevent leakage of harmful substances eluted from the waste. Therefore, conventionally, a tunnel construction method for constructing a waste treatment tunnel has employed a method of lining the wall surface of the excavated mine with concrete or the like.

また、放射性廃棄物を埋設処分する場合では、上記した埋設処分する際に、廃棄物をベントナイト等からなる遮蔽材で囲った状態で地下坑道内に定置される。これにより、放射性廃棄物から抽出される放射性物質の地下水への漏洩を抑制することができる(例えば、特許文献1参照。)。
特開2005−144278号公報
In the case of burying radioactive waste, the waste is placed in an underground mine with the waste surrounded by a shielding material made of bentonite or the like. Thereby, the leakage to the groundwater of the radioactive substance extracted from a radioactive waste can be suppressed (for example, refer patent document 1).
JP 2005-144278 A

しかしながら、上記した従来のトンネル工法では、千年或いは万年単位の超長期の経過劣化により、坑壁を覆う覆工の透水性が増大し、廃棄物から溶出される有害物質が周辺地盤内に漏洩し得る虞があるという問題がある。また、従来のトンネル工法では、超長期の期間経過で、覆工等のセメント系部材からセメント成分が溶出され、このセメント成分のカルシウム成分や高アルカリ性により、廃棄物を囲うベントナイト製遮蔽材が材質劣化し、その低透水性能を確保できなくなり、放射性物質の地下水への漏洩が生じる虞があるという問題がある。   However, in the conventional tunneling method described above, the permeability of the lining covering the mine wall increases due to the deterioration over a long period of thousands or thousands of years, and harmful substances eluted from the waste leak into the surrounding ground. There is a problem that it may be possible. Also, in the conventional tunneling method, cement components are eluted from cement-based members such as linings after a very long period of time, and the bentonite shielding material surrounding the waste is made of the material due to the calcium component and high alkalinity of this cement component. There is a problem that it deteriorates and cannot ensure its low water permeability, and there is a risk of leakage of radioactive substances into groundwater.

本発明は、上記した従来の問題が考慮されたものであり、廃棄物から溶出される有害物質の漏洩を超長期にわたって抑制することが可能な地下坑道を構築することができるトンネル工法を提供することを目的としている。   The present invention takes into consideration the above-described conventional problems, and provides a tunnel construction method capable of constructing an underground tunnel capable of suppressing leakage of harmful substances eluted from waste for an extremely long period of time. The purpose is that.

請求項1記載の発明は、廃棄物を埋設処分する地下坑道を構築するトンネル工法において、地盤内に掘削された坑の内部で、坑周方向に沿って延在する複数の支保部材を、坑軸方向に間隔をあけて並設させ、隣り合う支保部材間に板状部材を挟み込み、板状部材と坑壁面との間に、膨潤性粘土材料を含有する粘土系止水材を充填することを特徴とするトンネル工法。   The invention according to claim 1 is a tunnel construction method for constructing an underground tunnel for burying and disposing of waste, and a plurality of support members extending along the circumferential direction of a mine excavated in the ground are provided. Axial spacing is provided side by side, a plate-like member is sandwiched between adjacent support members, and a clay-based waterstop material containing a swellable clay material is filled between the plate-like member and the well wall surface. A tunnel construction method characterized by

このような特徴により、板状部材と坑壁面との間に充填された粘土系止水材は、それに含まれる膨潤性粘土材料が地下水の供給を受けて吸水膨潤することで、支保部材や板状部材に隙間無く密着されるとともに、支保部材と坑壁面との間に生じる空間にも充填される。また、セメント系の止水材でなく、粘土系止水材を使用するため、セメント成分が溶出されることがない。さらに、超長期の期間経過により、支保部材等が腐食劣化して欠陥部分が生じた場合には、粘土系止水材に含まれる膨潤性粘土材料が吸水膨潤してその欠陥部分が埋められる。   Due to such characteristics, the clay-based waterstop material filled between the plate-like member and the wall surface of the mine is supported by the support member and the plate by the water-swelling swelling of the swellable clay material contained therein receiving the supply of groundwater. The space between the support member and the wall surface of the pit is filled with the space between the support member and the wall surface. Further, since a clay-based water-stopping material is used instead of a cement-type water-stopping material, the cement component is not eluted. Further, when the supporting member or the like is deteriorated due to corrosion and a defective portion is generated due to the elapse of an extremely long period of time, the swellable clay material contained in the clay-based waterstop material swells and fills the defective portion.

請求項2記載の発明は、請求項1記載のトンネル工法において、可撓性および通水性をそれぞれ有する袋体の中に粘土系止水材を詰めたものを、板状部材と坑壁面との間に詰め込むことで、板状部材と坑壁面との間に粘土系止水材を充填することを特徴としている。   The invention according to claim 2 is the tunnel construction method according to claim 1, in which a clay-based waterstop material is packed in a flexible and water-permeable bag body, It is characterized by filling the clay-based waterstop material between the plate-like member and the wall surface of the pit by stuffing them in between.

このような特徴により、通水性のある袋体の中には地下水が浸入し、袋体の中に詰められた粘土系止水材に含まれる膨潤性粘土材料が膨潤することで、可撓性のある袋体はその形状が変形し、支保部材と坑壁面との間に生じる空間やその他の隙間にも満遍無く密に充填される。   Due to these characteristics, groundwater infiltrates into the water-permeable bag, and the swelling clay material contained in the clay-based water blocking material packed in the bag swells, thereby allowing flexibility. The shape of the bag is deformed, and the space formed between the support member and the wall surface of the pit and other gaps are filled evenly and densely.

本発明に係るトンネル工法によれば、粘土系止水材に含まれる膨潤性粘土材料が地下水の供給を受けて吸水膨潤することで、粘土系止水材が隙間無く密に充填されるため、支保部材と板状部材と粘土系止水材からなる支保工構造(覆工構造)が止水効果を発揮し、坑壁面からの湧水が少なくなり、廃棄物から溶出される有害物質の漏洩を抑制できる地下坑道を構築することが可能となる。また、セメント系の止水材でなく、粘土系止水材を使用することにより、超長期の期間経過後にセメント成分が溶出されることがないため、例えば放射性廃棄物を処理する際に、その廃棄物の周囲に形成されるベントナイト等からなる遮蔽材が材質劣化することがなく、超長期にわたる漏出抑制が可能な地下坑道を構築することができる。さらに、超長期の期間経過により、支保部材等が腐食劣化して欠陥部分が生じた場合には、粘土系止水材に含まれる膨潤性粘土材料が吸水膨潤してその欠陥部分が埋められるため、超長期にわたる漏出抑制が可能な地下坑道を構築することができる。   According to the tunnel method according to the present invention, the swellable clay material contained in the clay-based waterstop material is supplied with groundwater and absorbs and swells, so that the clay-based waterstop material is closely packed without gaps, Support structure (lining structure) consisting of support members, plate-like members and clay-based water-stopping material exerts a water-stopping effect, reduces spring water from the pit wall, and leaks harmful substances eluted from waste It is possible to construct an underground mine that can suppress the above. In addition, by using a clay-based water-stopping material instead of a cement-based water-stopping material, the cement component will not be eluted after a very long period of time. For example, when processing radioactive waste, It is possible to construct an underground mine that can prevent leakage for a very long time without deterioration of the shielding material made of bentonite or the like formed around the waste. Furthermore, when the supporting member or the like is deteriorated by corrosion due to the passage of a very long period of time and a defective part is generated, the swellable clay material contained in the clay-based waterstop material swells and fills the defective part. It is possible to construct an underground mine that can suppress leakage for an extremely long time.

また、可撓性および通水性をそれぞれ有する袋体の中に粘土系止水材を詰めたものを、板状部材と坑壁面との間に詰め込むことで、板状部材と坑壁面との間に粘土系止水材を充填すれば、板状部材と坑壁面との間に粘土系止水材が満遍無く密に充填されるため、粘土系止水材を充填する充填設備を設置する必要がなく、設備費用を低減させることができるとともに、坑の切羽が小径であって充填設備が設置できないような場合でも板状部材と坑壁面との間に粘土系止水材を充填することができる。   In addition, by filling a bag body having flexibility and water permeability with a clay water-stopping material between the plate-like member and the pit wall surface, the gap between the plate-like member and the pit wall surface can be obtained. If the clay-based waterstop material is filled in, the clay-type waterstop material will be filled evenly and densely between the plate-like member and the wall surface of the mine. There is no need to reduce equipment costs, and even when the face of the mine is small in diameter and the filling equipment cannot be installed, a clay-type waterstop material is filled between the plate-like member and the pit wall surface. Can do.

以下、本発明に係るトンネル工法の第一,第二の実施の形態について、図面に基いて説明する。   Hereinafter, the first and second embodiments of the tunnel construction method according to the present invention will be described with reference to the drawings.

[第一の実施の形態]
まず、廃棄物を埋設処理するための地下坑道1の構成について説明する。
図1は地下坑道1を表す断面図であり、図2は図1に示すA−A間の断面図である。図1,図2に示すように、地下坑道1は、例えば軟質岩盤等からなる地盤G内に形成された坑2の内側に、坑壁面2aを覆う覆工(トンネル支保工3)が構築された構成からなる。
[First embodiment]
First, the structure of the underground mine 1 for burying waste will be described.
FIG. 1 is a cross-sectional view showing an underground mine 1, and FIG. 2 is a cross-sectional view taken along a line AA shown in FIG. As shown in FIGS. 1 and 2, the underground mine 1 is constructed with a lining (tunnel support 3) covering the mine wall surface 2 a inside the mine 2 formed in the ground G made of soft rock, for example. Consisting of

図3はトンネル支保工3の一部分を表す拡大断面図であり、図4は図3に示すB−B間の断面図である。図1,図2,図3,図4に示すように、トンネル支保工3は、坑2の周方向に沿って延在する複数の支保部材4…と、隣り合う支保部材4,4同士を繋ぐ複数の連結部材(タイロッド5…)と、隣り合う支保部材4,4間に介装された複数の板状部材6…と、板状部材6…と坑壁面2aとの間に充填された粘土系止水材7とから構成されている。   FIG. 3 is an enlarged cross-sectional view showing a part of the tunnel support 3, and FIG. 4 is a cross-sectional view between BB shown in FIG. 3. As shown in FIGS. 1, 2, 3, and 4, the tunnel support 3 includes a plurality of support members 4 extending along the circumferential direction of the pit 2 and adjacent support members 4, 4. A plurality of connecting members (tie rods 5) to be connected, a plurality of plate-like members 6 interposed between the adjacent support members 4 and 4, and the plate-like members 6 and the well wall 2a are filled. It is composed of a clay-based waterstop material 7.

支保部材4…は、H形鋼やI形鋼等の複数の長尺鋼材8…をボルト等で継手してなるものであり、坑2のアーチ部2b、側壁部2c,2c及びインバート部2dのそれぞれに沿って設けられて環状に形成されている。支保部材4は、坑2内に複数設けられ、これら複数の支保部材4…は、坑2の軸方向に所定の間隔をあけて並べられ、坑2内にあばら骨状に配設されている。各長尺鋼材8…は、その外フランジ8aを坑壁面2aに対向させる向きで配設されているとともに、坑壁面2aに沿って撓った形状になっている。   The supporting members 4 are formed by joining a plurality of long steel materials 8 such as H-shaped steel and I-shaped steel with bolts or the like, and the arch portion 2b, side wall portions 2c, 2c, and inverted portion 2d of the pit 2. Are provided along each of them, and are formed in an annular shape. A plurality of support members 4 are provided in the pit 2, and the plurality of support members 4... Are arranged at predetermined intervals in the axial direction of the mine 2 and are arranged in a rib shape in the mine 2. Each of the long steel members 8 is disposed in a direction in which the outer flange 8a faces the well wall surface 2a and is bent along the well wall surface 2a.

タイロッド5…は、坑2の軸線に平行する方向に延在して隣り合う支保部材4,4間に架け渡されたロッド状の部材であり、対向する長尺鋼材8,8のウェブ8b,8b間に介装された断面形状円形の鋼管からなる本体部5aと、本体部5aを両側の長尺鋼材8,8のウェブ8b,8bに裏から固定する固定具5bとから構成されている。複数のタイロッド5…は、支保部材4の延在方向に沿って所定の間隔をあけて並列されている。   The tie rods 5 are rod-shaped members that extend in a direction parallel to the axis of the pit 2 and are spanned between adjacent support members 4, 4. The webs 8 b of the long steel members 8, 8 facing each other. The main body 5a is formed of a steel pipe having a circular cross-sectional shape interposed between 8b, and a fixture 5b for fixing the main body 5a to the webs 8b, 8b of the long steel members 8, 8 on both sides from the back. . The plurality of tie rods 5 are arranged in parallel at predetermined intervals along the extending direction of the support member 4.

板状部材6…は、デッキプレートやスキンプレートなどの波型鋼板からなる。板状部材6…は、その両端部を内フランジ8a´(突起部)の裏面に当接させた状態で平行する長尺鋼材8,8間(支保部材4,4間)に嵌め込まれており、坑壁面2aとの間に隙間があけられた状態で設置されている。   The plate-like members 6 are made of corrugated steel plates such as deck plates and skin plates. The plate-like members 6 are fitted between the long steel members 8 and 8 (between the support members 4 and 4) which are parallel to each other in a state where both ends thereof are in contact with the back surface of the inner flange 8a '(protrusion). It is installed in a state where a gap is opened between the pit wall surface 2a.

粘土系止水材7は、水分が加えられると膨潤する膨潤性粘土材料(ベントナイト)を含有する液体状、粉粒体状、或いは粘性体状の止水材であり、例えば、ベントナイト粉体やベントナイト粒状体(顆粒体)、ベントナイト原鉱石粉砕材等の膨潤性粘土材料のみからなる粘土系止水材7でもよく、或いはそれら膨潤性粘土材料に砂や礫等を混合させた混合材料等からなる粘土系止水材7でもよい。粘土系止水材7は、隣り合う支保部材4,4と板状部材6…と坑壁面2aとで囲まれた範囲に密に充填されており、さらに、坑壁面2aからの地下水の供給を受けて膨潤することで長尺鋼材8の外フランジ8aと坑壁面2aとの隙間にまで密に充填されている。   The clay-based waterstop material 7 is a liquid, granular or viscous water-stop material containing a swellable clay material (bentonite) which swells when moisture is added. For example, bentonite powder or It may be a clay-based water-stopping material 7 made only of swelling clay material such as bentonite granular material (granular material), bentonite raw ore pulverized material, or a mixed material in which sand or gravel is mixed with the swelling clay material. The clay-based waterstop material 7 may be used. The clay-based water blocking material 7 is densely filled in a range surrounded by the adjacent support members 4, 4, the plate-like members 6, and the pit wall surface 2 a, and further supplies groundwater from the pit wall surface 2 a. By receiving and swelling, the gap between the outer flange 8a of the long steel material 8 and the well wall surface 2a is filled densely.

次に、上記した構成からなる地下坑道1の構築するトンネル工法について説明する。
図5は地下坑道1内に構築されるトンネル支保工3の建て込み状況を表した斜視図である。
まず始めに、図1,図2に示すように、地盤G内に坑2を形成する掘削工程を行う。具体的には、掘削機等によって坑2先端部の切羽でトンネル支保工3の1スパン分相当だけ掘進する。
Next, the tunnel construction method constructed by the underground mine 1 having the above-described configuration will be described.
FIG. 5 is a perspective view showing a built-in state of the tunnel support 3 constructed in the underground mine 1.
First, as shown in FIGS. 1 and 2, an excavation process for forming a pit 2 in the ground G is performed. Specifically, the excavator or the like excavates for one span of the tunnel support 3 at the face of the tip of the mine 2.

次に、図3,図4,図5に示すように、複数の支保部材4…を坑2軸方向に所定の間隔をあけて並設させるとともに、隣り合う支保部材4,4同士を複数のタイロッド5…で連結する支保組立工程を行う。具体的には、各長尺鋼材8…を坑2の坑壁面2aに沿って所定位置に配置するとともに、隣接する長尺鋼材8,8同士を継手して環状に組み立てることで、各支保部材4…をそれぞれ形成する。このとき、隣り合う支保部材4,4間の所定位置に、タイロッド5の本体部5aを配置するとともに、その本体部5aの両端を、両側の長尺鋼材8,8のウェブ8b,8b裏から固定具5b,5bでそれぞれ固定する。   Next, as shown in FIGS. 3, 4, and 5, a plurality of support members 4... The support assembly process of connecting with tie rods 5 is performed. Specifically, the long steel members 8 are arranged at predetermined positions along the pit wall 2a of the pit 2, and the adjacent long steel members 8 and 8 are joined together and assembled into an annular shape, thereby supporting each supporting member. 4 ... are formed. At this time, the main body 5a of the tie rod 5 is disposed at a predetermined position between the adjacent support members 4 and 4, and both ends of the main body 5a are connected to the long steel members 8 and 8 on both sides from the back of the webs 8b and 8b. It fixes with the fixing tools 5b and 5b, respectively.

次に、隣り合う支保部材4,4間に複数の板状部材6…を挟み込みつつ、その板状部材6…と坑壁面2aとの間に生じた空間に粘土系止水材7を充填する覆工工程を行う。具体的には、まず、板状部材6を、隣り合う支保部材4,4の内フランジ8a´,8a´の裏側に入れて、その両端部を両側の内フランジ8a´,8a´の裏面にそれぞれ当接させて建て掛ける。このとき、板状部材6と両側の支保部材4,4とを溶接等により接合してもよい。続いて、坑2内に設置された充填設備10によって、板状部材6の裏側に生じた空間内に粘土系止水材7を打設する。充填設備10は、粘土系止水材7を貯蔵する漏斗形のホッパー11と、ホッパー11の吐出口11aに接続された供給管12と、供給管12の先端部12aに接続されたフレキシブルホース13と、供給管12の基端部12bに接続されたコンプレッサー14とから構成されており、ホッパー11内の粘土系止水材7は、吐出口11aから供給管12内に流入し、コンプレッサー14から供給管12内に送り込まれた圧縮空気によってエア圧送されて供給管12内からフレキシブルホース13内を経てフレキシブルホース13の先端から流れ出る。板状部材6の上端付近まで粘土系止水材7を充填したら、粘土系止水材7の充填作業を一旦停止し、板状部材6の設置作業を行った後、再び粘土系止水材7の充填作業を開始する。この板状部材6の設置作業と粘土系止水材7の充填作業を繰り返すことで、各支保部材4,4間を閉塞する。   Next, while sandwiching a plurality of plate-like members 6 between the adjacent support members 4, 4, a clay-based waterstop material 7 is filled into a space formed between the plate-like members 6. Perform the lining process. Specifically, first, the plate-like member 6 is put on the back side of the inner flanges 8a 'and 8a' of the adjacent support members 4 and 4, and both ends thereof are placed on the back surfaces of the inner flanges 8a 'and 8a' on both sides. Build them in contact with each other. At this time, the plate-like member 6 and the supporting members 4 and 4 on both sides may be joined by welding or the like. Subsequently, the clay-based waterstop material 7 is placed in the space generated on the back side of the plate-like member 6 by the filling equipment 10 installed in the pit 2. The filling facility 10 includes a funnel-shaped hopper 11 for storing the clay-based waterstop material 7, a supply pipe 12 connected to the discharge port 11 a of the hopper 11, and a flexible hose 13 connected to the distal end portion 12 a of the supply pipe 12. And the compressor 14 connected to the base end portion 12b of the supply pipe 12, and the clay water-stopping material 7 in the hopper 11 flows into the supply pipe 12 from the discharge port 11a and from the compressor 14. Air is compressed by compressed air sent into the supply pipe 12 and flows out of the supply pipe 12 from the tip of the flexible hose 13 through the flexible hose 13. After the clay-based waterstop material 7 is filled up to the vicinity of the upper end of the plate-like member 6, the clay-type waterstop material 7 filling operation is temporarily stopped, and after the plate-like member 6 is installed, the clay-type waterstop material is again used 7 filling operation is started. By repeating the installation work of the plate-like member 6 and the filling work of the clay-based waterstop material 7, the space between the support members 4 and 4 is closed.

次に、上述したトンネル支保工3の1スパン分相当だけ掘進する掘削工程に戻り、支保組立工程、覆工工程をそれぞれ行い、地下坑道1をスパンごとに順次構築していく。   Next, returning to the excavation process for excavating one span of the tunnel support 3 described above, the support assembly process and the lining process are performed, and the underground mine 1 is sequentially constructed for each span.

上記した構成からなるトンネル工法によれば、地盤G内に掘削された坑2の内部で、複数の支保部材4…を坑2の軸方向に間隔をあけて並設させ、隣り合う支保部材4,4間に板状部材6…を挟み込み、板状部材6…と坑壁面2aとの間に、膨潤性粘土材料を含有する粘土系止水材7を充填するため、粘土系止水材7に含まれる膨潤性粘土材料が地下水の供給を受けて吸水膨潤することで、粘土系止水材7が、支保部材4…や板状部材6…に隙間無く密着されるとともに支保部材4の外フランジ8aと坑壁面2aとの間に生じる隙間にも充填されて、隙間無く密に充填される。これによって、支保部材4…と板状部材6…と粘土系止水材7からなるトンネル支保工3(支保工構造)が止水効果を発揮し、坑壁面2aからの湧水が少なくなり、廃棄物から溶出される有害物質の漏洩を抑制できる地下坑道1を構築することができる。   According to the tunnel construction method having the above-described configuration, a plurality of support members 4... Are arranged side by side in the axial direction of the well 2 inside the well 2 excavated in the ground G, and adjacent support members 4. , 4 is sandwiched between the plate-like members 6... And the clay-type water-stopping material 7 containing the swellable clay material is filled between the plate-like members 6. When the swellable clay material contained in the water is swollen by receiving groundwater, the clay-based waterstop material 7 is brought into close contact with the support members 4 and the plate-like members 6 without any gaps, and the outside of the support member 4. The gap formed between the flange 8a and the pit wall surface 2a is also filled, and the gap is densely filled with no gap. As a result, the tunnel support 3 (support structure) composed of the support members 4, the plate-like members 6, and the clay water-stopping material 7 exhibits a water-stopping effect, and the spring water from the pit wall surface 2 a is reduced. It is possible to construct an underground mine 1 that can suppress leakage of harmful substances eluted from waste.

また、セメント系の止水材でなく、粘土系止水材7を使用しているため、千年或いは万年の超長期の期間経過後にもセメント成分が溶出されることがない。これによって、例えば放射性廃棄物を埋設処理する際に、その廃棄物の周囲に形成されるベントナイト等からなる遮蔽材が材質劣化することがなく、超長期にわたる漏出抑制が可能な地下坑道1を構築することができる。   Further, since the clay-based water-stopping material 7 is used instead of the cement-type water-stopping material, the cement component is not eluted even after an extremely long period of 1000 years or 10,000 years. As a result, for example, when embedding radioactive waste, the underground mine 1 that can suppress leakage for an extremely long time without the material deterioration of the shielding material made of bentonite or the like formed around the waste is constructed. can do.

さらに、膨潤性粘土材料を含有する粘土系止水材7が使用されるため、超長期の期間経過により、支保部材4…や板状部材6…が腐食劣化して欠陥部分が生じた場合でも、粘土系止水材7に含まれる膨潤性粘土材料が吸水膨潤してその欠陥部分が埋められる。これにより、超長期にわたる漏出抑制が可能な地下坑道1を構築することができる。   Further, since the clay-based waterstop material 7 containing the swellable clay material is used, even if the supporting member 4... Or the plate-like member 6. The swellable clay material contained in the clay-based waterstop material 7 absorbs water and swells to fill the defective portion. Thereby, the underground mine 1 which can control the leakage over a super-long term can be constructed.

[第二の実施の形態]
次に、本発明に係るトンネル工法の第二の実施の形態について説明する。なお、上述した第一の実施の形態と同様な構成については、同じ符号を付すことでその説明を省略する。
[Second Embodiment]
Next, a second embodiment of the tunnel method according to the present invention will be described. In addition, about the structure similar to 1st embodiment mentioned above, the description is abbreviate | omitted by attaching | subjecting the same code | symbol.

図6は地下坑道1内に構築されるトンネル支保工3の建て込み状況を表した斜視図である。図6に示すように、予め、袋体20の中に粘土系止水材7を詰めた土嚢状のもの(止水体21)を複数用意しておく。そして、複数の支保部材4…を組み立てる支保組立工程を行った後、隣り合う支保部材4,4間に複数の板状部材6…を挟み込みつつ、その板状部材6…と坑壁面2aとの間に生じた空間に、予め用意された複数の止水体21…を詰め込んでいくことで、板状部材6…と坑壁面2aとの間に粘土系止水材7を充填する。   FIG. 6 is a perspective view showing a built-in situation of the tunnel support 3 constructed in the underground mine 1. As shown in FIG. 6, a plurality of sandbags (water stop bodies 21) in which a clay water stop material 7 is packed in a bag body 20 are prepared in advance. And after performing the support assembly process which assembles several support member 4 ..., while sandwiching several plate-shaped member 6 ... between the adjacent support members 4, 4, between the plate-shaped member 6 ... and the pit wall surface 2a, The clay water-stopping material 7 is filled between the plate-like members 6 and the pit wall surface 2a by filling a plurality of water-stopping bodies 21 prepared in advance into the space formed therebetween.

袋体20は、形状を容易に変えることができる可撓性を有するとともに地下水を中に流入或いは浸透させることができる通水性を有する材料からなる。例えば、多数の孔があけられたビニール製の袋や、メッシュ状の樹脂製の網袋や、透水性のある布袋などである。   The bag body 20 is made of a material having flexibility that can be easily changed in shape and water permeability that allows inflow or infiltration of groundwater. For example, a plastic bag having a large number of holes, a mesh-like resin net bag, a water-permeable cloth bag, and the like.

板状部材6の上端付近まで止水体21を詰め込んだら、止水体21の詰め込み作業を一旦停止し、板状部材6の設置作業を行った後、再び止水体21の詰め込み作業を開始する。この板状部材6の設置作業と止水体21の詰め込み作業を繰り返すことで、各支保部材4,4間を閉塞する。   When the waterstop 21 has been packed to the vicinity of the upper end of the plate member 6, the filling operation of the waterstop 21 is temporarily stopped, and after the installation work of the plate member 6, the waterstop 21 is started again. By repeating the installation work of the plate-like member 6 and the filling work of the waterstop 21, the support members 4 and 4 are closed.

上記した構成からなるトンネル工法によれば、第一の実施の形態と同様な作用効果を奏することができるだけでなく、更なる作用効果を奏することができる。つまり、可撓性および通水性をそれぞれ有する袋体20の中に粘土系止水材7を詰めたものを、板状部材6と坑壁面2aとの間に詰め込むことで、板状部材6と坑壁面2aとの間に粘土系止水材7を充填しているため、通水性のある袋体20の中には地下水が浸入し、袋体20の中に詰められた粘土系止水材7に含まれる膨潤性粘土材料が膨潤することで、可撓性のある袋体20はその形状が変形し、支保部材4の外フランジ8aと坑壁面2aとの間に生じる空間やその他の隙間にも満遍無く密に充填される。これによって、上述した第一の実施の形態のように充填設備10を用意する必要が無く、設備費用を低減させることができるとともに、坑2の切羽が小径であって図5に示すような充填設備10が設置できないような場合でも板状部材6…と坑壁面2aとの間に粘土系止水材7を充填することができる。   According to the tunnel construction method having the above-described configuration, not only the same operational effects as the first embodiment can be achieved, but also further operational effects can be achieved. That is, by filling the bag 20 having flexibility and water permeability with the clay-based waterstop material 7 between the plate-like member 6 and the pit wall surface 2a, the plate-like member 6 and Since the clay-based waterstop material 7 is filled between the wall surface 2a and the water-permeable bag body 20, groundwater infiltrates into the bag body 20, and the clay-type waterstop material packed in the bag body 20 As the swellable clay material contained in 7 swells, the shape of the flexible bag 20 is deformed, and a space or other gap formed between the outer flange 8a of the support member 4 and the well wall surface 2a. Evenly and densely packed. As a result, it is not necessary to prepare the filling facility 10 as in the first embodiment described above, the facility cost can be reduced, and the face of the pit 2 has a small diameter and is filled as shown in FIG. Even when the facility 10 cannot be installed, the clay-based waterstop material 7 can be filled between the plate-like members 6 and the pit wall surface 2a.

以上、本発明に係るトンネル工法の第一、第二の実施の形態について説明したが、本発明は上記した実施の形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。例えば、上記した第一、第二の実施の形態では、支保部材4が、坑2のアーチ部2b、側壁部2c,2c及びインバート部2dのそれぞれに沿って設けられて環状に形成されているが、本発明は、地盤が硬い場合等には、坑のアーチ部および側壁部に沿って設けられた門形の支保部材であってもよい。   The first and second embodiments of the tunnel method according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the scope of the present invention. is there. For example, in the above-described first and second embodiments, the support member 4 is provided along each of the arch portion 2b, the side wall portions 2c, 2c, and the invert portion 2d of the pit 2, and is formed in an annular shape. However, when the ground is hard, the present invention may be a gate-shaped support member provided along the arch and side walls of the mine.

また、上記した第一、第二の実施の形態では、板状部材6として波型鋼板が用いられているが、本発明はこれに限定されるものではなく、例えば、平らな鋼板を使用してもよく、また、木板などを使用してもよい。   In the first and second embodiments described above, a corrugated steel plate is used as the plate-like member 6, but the present invention is not limited to this, and for example, a flat steel plate is used. Alternatively, a wooden board or the like may be used.

また、上記した第一の実施の形態では、坑2の切羽にホッパー11やコンプレッサー14などが設置された充填設備10が用いられているが、本発明は、この充填設備10に限定されるものではなく、例えば、切羽の後方にホッパーやコンプレッサーなどが設置され、供給管が切羽部分まで配管された構成の充填設備でもよく、その他の充填設備によって板状部材と坑壁面との間に粘土系止水材を充填してもよい。   In the first embodiment described above, the filling facility 10 in which the hopper 11 and the compressor 14 are installed at the face of the pit 2 is used. However, the present invention is limited to this filling facility 10. Instead, for example, it may be a filling facility in which a hopper or a compressor is installed behind the face, and the supply pipe is piped up to the face, or other clay filling system between the plate-like member and the pit wall surface. You may fill with a water stop material.

また、上記した第一の実施の形態では、坑壁面2aと板状部材6との間に、粘土系止水材7を上から充填する方法が採用されているが、本発明は、この充填方法に限定されるものではなく、例えば、予め、板状部材或いは支保部材のフランジに注入口を設けておき、この注入口から粘土系止水材を充填してもよい。   In the first embodiment described above, a method of filling the clay-based waterstop material 7 from above between the pit wall surface 2a and the plate-like member 6 is employed. The method is not limited, and for example, an inlet may be provided in advance in the flange of the plate-like member or the supporting member, and the clay-based waterstop material may be filled from the inlet.

また、粘土系止水材7を板状部材6…と坑壁面2aとの間に充填する方法として、第一の実施の形態では、充填設備10を使用して充填しており、第二の実施の形態では袋体20の中に粘土系止水材7を詰めてこれを詰め込む方法を採用しているが、本発明は、上記した2つの方法を併用して粘土系止水材の充填作業を行っても良い。   In addition, as a method of filling the clay-based waterstop material 7 between the plate-like member 6... And the pit wall surface 2a, in the first embodiment, filling is performed using the filling equipment 10, and the second In the embodiment, a method of filling the clay water-stopping material 7 in the bag body 20 and stuffing it is adopted. However, the present invention uses the above two methods in combination to fill the clay water-stopping material. You may do the work.

本発明に係る第一の実施の形態を説明するための地下坑道を表した断面図である。It is sectional drawing showing the underground mine for demonstrating 1st embodiment which concerns on this invention. 図1に示すA−A間の断面図である。It is sectional drawing between AA shown in FIG. 本発明に係る第一の実施の形態を説明するための地下坑道の詳細を表した部分断面図である。It is a fragmentary sectional view showing the detail of the underground mine for demonstrating 1st embodiment which concerns on this invention. 図3に示すB−B間の断面図である。It is sectional drawing between BB shown in FIG. 本発明に係る第一の実施の形態を説明するための施工状況を表した斜視図である。It is a perspective view showing the construction situation for explaining a first embodiment concerning the present invention. 本発明に係る第二の実施の形態を説明するための施工状況を表した斜視図である。It is a perspective view showing the construction situation for explaining a second embodiment concerning the present invention.

符号の説明Explanation of symbols

1 地下坑道
2 坑
2a 坑壁面
4 支保部材
6 板状部材
7 粘土系止水材
20 袋体
G 地盤
DESCRIPTION OF SYMBOLS 1 Underground mine 2 Mine 2a Mine wall surface 4 Support member 6 Plate-shaped member 7 Clay-based waterproofing material 20 Bag G Ground

Claims (2)

廃棄物を埋設処分する地下坑道を構築するトンネル工法において、
地盤内に掘削された坑の内部で、坑周方向に沿って延在する複数の支保部材を、坑軸方向に間隔をあけて並設させ、
隣り合う支保部材間に板状部材を挟み込み、
板状部材と坑壁面との間に、膨潤性粘土材料を含有する粘土系止水材を充填することを特徴とするトンネル工法。
In the tunnel construction method of constructing underground tunnels to bury waste,
Within the mine excavated in the ground, a plurality of support members extending along the circumferential direction of the mine, are arranged side by side in the direction of the mine shaft,
A plate-like member is sandwiched between adjacent support members,
A tunnel construction method characterized by filling a clay-based waterstop material containing a swellable clay material between a plate-like member and a wall surface of a mine.
請求項1記載のトンネル工法において、
可撓性および通水性をそれぞれ有する袋体の中に粘土系止水材を詰めたものを、板状部材と坑壁面との間に詰め込むことで、板状部材と坑壁面との間に粘土系止水材を充填することを特徴とするトンネル工法。
In the tunnel construction method according to claim 1,
Clay between the plate-like member and the pit wall surface is packed between the plate-like member and the pit wall surface by filling a clay body water-stopping material in a flexible and water-permeable bag body. A tunnel construction method characterized by filling a water-stopping material.
JP2005263280A 2005-09-12 2005-09-12 Tunnel construction method Pending JP2007077585A (en)

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JP2009276335A (en) * 2008-02-08 2009-11-26 Shimizu Corp Tunnel for radioactive waste disposal
JP2014525033A (en) * 2011-07-02 2014-09-25 ルンプ,ビヨルン・ジイグート Safe reactor plant construction method and corresponding reactor plant
WO2015124773A1 (en) * 2014-02-24 2015-08-27 Cura Ingenieurgesellschaft Mbh Container for the storage of radioactive waste

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